Damic Posted August 11 Share Posted August 11 Hi; why aren't there lower current CT's like 25A? I like the 3EM and PRO50 but it would be nice to chose with lower value CT's. As an example my own home: main breaker is 1phase 40A (but I can upgrade to 3x25A) al the rest is 20A (of 16A for lights) Or I for-see every group I want to monitor with a PM mini, or I could take a 3EM/PRO50 and have 25A CT's on it = less main devices in the cabinet What would Shelly think of that? *CT: current transformer Quote Link to comment Share on other sites More sharing options...
tvbshelly Posted August 11 Share Posted August 11 Why not also measure the lower currents with 50A or 120A CTs? For example, I use a PRO 3EM with 120A CTs to measure my three-phase PV system, which has a maximum of 16A per phase and the measured values are correct. 1 Quote Link to comment Share on other sites More sharing options...
Damic Posted August 19 Author Share Posted August 19 Yes you can do that, but on lower currents the tolerance is way worse. 1 Quote Link to comment Share on other sites More sharing options...
Members thgoebel Posted August 19 Members Share Posted August 19 (edited) Transmission ratio of both current clamps is 1:3000. Τhus, the secondary current is the same with both types. Only the saturation limit of the ferrit core is different. Edited August 19 by thgoebel 1 Quote Link to comment Share on other sites More sharing options...
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